The Guarantee of Origin system is currently governed by the Renewable Energy Directive (2009/28/EC). However, GO systems do vary between Member States. The link below provides information regarding the Italian GO system.
This will be the first in a series of papers by the Secretariat explaining, in brief, different national administrative processes as regards the EU’s GO system which will all be available to the members of RECS International.
The document on the Italian system can be downloaded here.